Whispering Death's Cave

Whispering Death's Cave is a non-member location added in 29 of August, 2013 in an unknown update, along with the quest Explore the Dark Depths.

Whispering Death's Cave is located in the Isle of Berk, on the right side of The Great Hall, and, it's unlocked with the mission Explore the Dark Depths. The player will spawn in a corner with a large hole above along with a rope descending from it.

The Entrance/Exit to the Caves

The Cave is filled with massive amounts of tunnels, in the center, there's an Underground Fishing Spot. If the player goes to the right tunnel, it will lead to a small green underground waterfall that serves as an orientation point (it's also located on the opposite side of the Starting Point).

The Green Underground Waterfall

There's also 2 large tunnels on the ceiling:

The first one is when you just walk straight from the starting point until you reach the small columns "windows". You will know that you're there if the Whispering Death flies towards it and comes back from it.

The second one is when you're at the Fishing Spot, go to the left side then right tunnel. There's another way to go there and is when you're below the first ceiling tunnel, head back left (near the tunnel that takes you to the starting point) and you should find it.

Both two are blocked by an invisible wall.

The first ceiling tunnel

The second ceiling tunnel

You will also see a Whispering Death flying in a certain pattern, you cannot interact with it nor shoot it, but, it won't also harm you, it's just there wandering around in a pattern loop.

In the v.2.3.0, if you entered the Caves after a long period of time of not entering it, the game will fail to load the world map and, make the player infinitely fall into nothing. However, if the player teleports back to Berk and reenters the hole, it will load the world map correctly.